How can I get my computer to display full screen on my HD TV without black bars? (Part 1)

Steve is visually impaired and his LCD TV, which he's using as a computer monitor, isn't showing the full screen. He has black bars along the sides. Leo says it may be because he's not using the native resolution, and he should make sure that it's set as close as he can get it. He could scale it and make it larger to fill the screen, but that would make it look blurry. He should figure out what the resolution is that the monitor can do and then see if the computer can match it. He can do this in Windows display settings.